CALLIOSTOMA. 379 



entirely white, not colored, it has seven Avhorls in a shell of the same 

 size as an apiciniim with six ; the sutures are slightly channelled, and 

 therefore distinctly visible ; there are four instead of nine beaded 

 ribs on the upper side of the last whorl, and the beads are coarser, 

 the interspaces wide enough to show the lines of growth crossing 

 them ; the nodules on the peripheral rib in this whorl are undula- 

 tions rather than beads, and sufficiently large to give a crenulated 

 appearance to the border of the shell when viewed from below ; there 

 are eight revolving ribs on the base crossed by fine ridges following 

 the lines of growth ; there is no umbilicus or callus ; the pillar is 

 not grooved or thickened ; the aperture is more oblique and propor- 

 tionately less wide. Alt. 5, diam. 4'12 mill. (Dal/.) 



Blake Station 2, 805 fms. 

 C. sapidum Dall, Bull. M. C. Z. ix, p. 46 ; ' Blake ' Gasterop., p. 

 364, t. 21, f. 2, 4. 



C. APiciNUM Dall. PI. 60, figs. 1, 2. 



Shell conical, of six whorls, elevated, thin, rather solid; whorls 

 and base flattened, the sutures hardly visible, the last whorl suban- 

 gulated, but not carinated, on the periphery Nucleus prominent, 

 bubble-shaped, shining opaque white ; second whorl deep rose-pink, 

 with three longitudinal beaded ribs ; rest of shell yellowish-white, 

 with indistinct clouds of brown transversely disposed on the upper 

 whorls; the lower rib on the second, third and part of the fourth 

 whorls with somewhat larger beads than the rest, crowning the 

 suture ; the upper side of the last whorl with about nine revolving 

 beaded ribs with a slight tendency to run in pairs, beginning at the 

 periphery ; base with eleven somewhat flattened ribs only the two 

 next the pillar beaded, the others crossed by evident lines of growth, 

 radiating in a wavy manner, umbilicus a hardly visible puncture ; 

 pillar grooved, hardly thickened, aperture not very oblique, crenu- 

 lated (especially below) by the ends of the ribs, subrectangular. 



Alt. 7i diam. 7 mill. {Dall.) 



Barbados, 100 fms.; Off Havana, lib fnis. 



C apicinum Dall, Bull. M. C. Z. ix, p. 46 ; ' Blake ' Gasterop., p. 

 366, t. 24, f. 3. 



The examination of another specimen shows that this species 

 covers the chink behind the pillar when adult, that there is a blunt 

 knob suggesting Thalotia on the pillar, and that it has 8 or 9 strong 

 lirse running into the throat and not connected with the outside 



